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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'da1a699f338107fc9b3636ef06cbfd6414becc783d8b611d8b727dc6e3258bed' 
  AND token = '8aLYQ3NAKqo4oP0A9kwUnu3KNVppJd8nQw3OHdv6wIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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