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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '659d28fcb8c9fb32b1cef291f0cef83ef82ffc0c3090c7baa107c807b52701e2' 
  AND token = 'JlpbnPh1e1uVL73oBqx3ky4TyCYanXdlG18NfYcbQdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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