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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8fd841216cb9aac744aaacdbcdb4857ea2ee0a2d251b1ba0b491487946511e9f' 
  AND token = 'k1JXP+L0HXOxlk6fUsIEWMBY2h57BGtDCimXMHs9Yng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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