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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '537fbe4bfa8d84673d7c6ac037086eb598e11c23709d7b25fdea0f9f9f580764' 
  AND token = 'WK4NpefQuXsYSEc3orYXlpZI07rKpwMQTx3tRkrffhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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