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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0baf2f8bc37a484d04e8c9cad8c629e1e9d8958f065ccbf16f7f0bf3cd0c082a' 
  AND token = 'zZ4ii1NT/wGcyobEbVc4Qwekor8D5p9fVvxCVi6vnVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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