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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aec385a1a90defdb85d8b85340bc404fdb86cba31276eb82b7448fd8bd4dd1a7' 
  AND token = 'r4noe270N5MPIlub56L2uwGBZWz/MQb8Y70elh/UD+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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