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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c858636d71103f05b392ee6bc677608e1790bf1561506949bbecbe5d58341774' 
  AND token = 'U3Qje7Z9MULudFur/3MIg9QRlTr7Ee3VOLesNPCkckI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00374

JSON explain

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