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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1236cba2a88b588dd41f5450d6619d7886b868ceb1a14e3ca1cd2f6a088d1f16' 
  AND token = 'DEulD3vXODmQR+oDEYxjSLFo2zQkuuCb5C8mY8veZt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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