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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f5b6ebd36b6622fa7f2cedc558e65d933bba47bde6df278286cad4c74f44a547' 
  AND token = 'ebDs50BvMa7bYM5EHN87ebH7g/nxFZ2zn9qYPRRL2iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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