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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a1b91fcf39918a07bf34b90f8f6429f720599b8f010f4e6c3f97b51db8972f6e' 
  AND token = 'ASJdkb/avKFlHTS4A2A6f52t0/h4GTXiU4alJxM3xVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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