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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b718d740459dcb89d9789bf7eedc2ee77f1957d398055e36257559d9369d3c18' 
  AND token = 'rTWKTYD9D1qN/9PKx3btZvWegBFsl73ZKDl3DHC4qiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}