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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a5506a0344a0b3f24d906913467e3382e56bd2947cdc806ce00edaf2b3c66e80' 
  AND token = 'U1N0aSafBAAx627nhKGkCP6W/uHPqexmod/ez/IVTnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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