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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b315302a50519a04082c2a8a4a404e3c7bae4e4234fc07f754643ac7fd0d1676' 
  AND token = 'yubfGGT1y6rS7YaCyW2i2dffCKeP4VVaP0FSQ1jbyWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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