SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a64e3411a94dc86b383863ca473224fca768362596c5721613f2d7c9f5f78d4b' 
  AND token = '8h+BhN2ppcUaOl1uUxKRqdKG/Kf+PSy3YYC0Hy3FoPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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