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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb5a7ccf86441d54556c74d902c9366a1ab13b2f2334a7861839b36bd36d78b4' 
  AND token = 'GTcH0Ay7WIzll6b7yxtEjHkHFDlWAR9/pK46ogDbVAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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