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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '47468aee0b1124029b487cd87d9c13bfc8b269036d1eca3a97d7cafc09f04da8' 
  AND token = 'UKcSWzvEsh/xfQUHj84ToGVd35xwSR1Sh0SN9QprRCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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