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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e00e93cf0a7874148916df0295261242eea1e134078da19f0b41baabdc7e97a1' 
  AND token = 'ZvLKTTVtfUOzfHaMZxB9jVAjv0yNn9ZrlSAjCc6/D5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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