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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b36e9a9e8328aeda78bf3c30e4432b9bc3a2da6d4897fd422ece26b36b9ce2e2' 
  AND token = 'Cv8tAcp46myBcwR8378w01ajHXSoA1L7N/sfMCtuQ54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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