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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69be88314273506ac9700f2bee24e25ad1a7da1a9f291dd63dcbcc022e4ab7a5' 
  AND token = 'umh3i4i9Lu8LuQbXTs50Qo4hLYBTS5dqXZs8lhb2AO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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