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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '89af200d83f350071e93f11c140e2d9c05f2d222bd67b19e0f05af15d62430c5' 
  AND token = 'dwOnaj6RnX/8JtSbm7SaychX6bRb0R8ZryAT/w57IWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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