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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a1d5df6d3a1476145308730dafe06003095ded495a0f789ae6af180796880e1' 
  AND token = 'nZCydG4wUJB01YaTn6qLtwZsKz/cz9WVCwftk+mG7uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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