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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '23edda5cb6d0d1a25a425281ffbd1964871c291e147158f27dfb3d8645c292de' 
  AND token = 'WZYSK67kzngG8ft7xykoXCXU8y0wwT8SI2snTSOAkjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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