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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b37dd901054819f4190b246fc1d3e056d2308f6db150519fc4ae7bed67a6a956' 
  AND token = '/MIB8yjhlmAUwb8sAIViMwjrebvLn6yR55VFuDwlsos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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