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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '83e46daee6b2f73d6125a3a21cedff5afda13a958a9d77178a2ee40f89318ac9' 
  AND token = 'ryCAmXSw7qy3q4B+/UaEDRI2c/xjzxDOtE6FKOXnkls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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