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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e809cde964aca30b9606cd294606a8e5724e6111c96a2875ec42ecb09881d167' 
  AND token = 'NfC9mbs408FzKKLqdIdFDJft3x1xnVFLV6XgODR+4ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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