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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '236f1c02e356423a350f0bf7ae5eb5c34d8fa0e21979d185d9571c9ed6678502' 
  AND token = 'wpzsVeMdPmhRXSsPnci94empZ5/c6CjUh1WGd785ekQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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