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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '44bb2c541aeac082214ebcb6d0571ea5a6cc73ded88132b5f6ee71c25bd43c8a' 
  AND token = '0qEcFsJma2s7zxsqy8G0BDRxl8RydBfpu1GXmVXUT7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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