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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b6847fe2fbcd3b6fdb8b2ed10f4336d652d25eee25e3673f5b1be82c7c4520e8' 
  AND token = 'qo9/K1Fq33kMFJcQdK96+kMeeMXI1Jmj2qrl2pCvRtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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