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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '12fe81a17bb8a2fb8ce46ff98def6bc06ce10f2e1aedebb508018ed6d63c19a7' 
  AND token = 'UcVm1iYpAlQiYjuMEesfgNJICDpNDzWUC1aQCbksW3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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