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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1261888972de23ac0b8dd7de4182d447b5ea2fbb1eb960b0a014f188d4902e65' 
  AND token = 'Hd1sgBRoXZ7iNdX0BCgpLeiRUDdmbGuo7uTJjvEn1yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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