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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f73ee6b611718e2272489c9e88d8ae725feba71a31875cf0734c288854d1855' 
  AND token = 'SOTV7LSyu3HAsgYcM3b5EtfVGjJfewk/hDvsig3FSRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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