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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0c87cabee8c4c0919b3c084c1b31e888f37f2e2d279f1a85881cc263ce32ff80' 
  AND token = 'LqGJ8hGHWpTOfY8j6pWieQXJa3K3Es+ikeKZTktG2kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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