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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ba13e283e6afae5c3ae283bfd91c5a39f2949a38a94a2170dbfccc075f3b825' 
  AND token = 'vmTJSQzvs6ltWN/Q7IjM7dxiM1IbXkqz4wM5BFAaSyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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