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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72ba4990a707f409a61be778b8b0a43f913574b06aa3b10e2c936596952d72cb' 
  AND token = 'MEcR2Ip3+xhfeP0gIXvtmKC+zN30bOtqaUvBYtNOVIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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