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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b148f3166ef89a5e2cc00018f5e69cf7304b32d80dfd7191b8457133023f699e' 
  AND token = 'yqRRRLEpOkq9OLyISEEYMOEUSGxNzl3Y6ySB17vlVYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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