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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '409e2c1d8dc2c26b4a8bc7f6ef893218efa21b470bd08b537cfbe6704ec31b90' 
  AND token = 'xLlzUfR71iuP49ypAKUkOZy42lsva+y2Kmuy9BAThO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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