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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae4fad4bc87240659aaad40c6a96df0d2d4570895fa2ba1d5854d802287db9b7' 
  AND token = 'SRtE/l9iq+c9cIAYmvw45tkqyK3H0SGG3GGe9Id4Xa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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