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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'de8614e5e09521baca6c3a3c26c87c198eac7b9970baaae539714b65964a15b3' 
  AND token = 'U5fz3YY8+94LSpbWRmxNTOAbMgOKI/1wUMDhgLxSjNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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