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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '052f764403570c4019b858671b02facf9fc7bc615d2e812899cf743aae164550' 
  AND token = 'WSYk6tFY8iYmbv73SNtJyTRFV6C6P1TDkQrfRjjAXtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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