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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b8837a74bd11d4c2b31a0ee53060cd9798cb9ee781e39791cda4c017704be819' 
  AND token = '4KZ10Gpn4kkQFTBzW4bips2/u6zf9NAm9gcP/EfWuBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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