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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '96fb4494c60b5c3fb4c2caadf5eaae52cb8e213be3b42cbf4ffe609439f59d01' 
  AND token = 'GUNiFyGpQgJvpYS60vPQYHdZC4VamK4HO4naqSvg8Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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