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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1db20aea0c9bcc4a443b26a547475d5a02dfdc741c06278af14e5128094391ed' 
  AND token = 'Udblgr+DWk84cQROcH7Mo7+abNeKzcrg6FWu3GDpw18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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