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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd7a1841efad7ccf6e1825a711cf2e470cffca0b94bde713f709fea0a486f06e8' 
  AND token = 'do1WkSv/wzhufxxUAjvYqQ32cOcVHZmQ4IOsSA6rwr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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