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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b3de14be3c6b6481d7b97be0dd8e38431f8af28dbe54bc290e4d366aadf61144' 
  AND token = '/5axSKn10at7M1c4sybQ2Zw99B78FAsgpRFxxCO7Bao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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