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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '55b810803a9d000da6eb677876019f4da35d213ca570aec59ae208429b3bfac8' 
  AND token = 'BZrhT9OJGB6LWeAdqdh6eD6KpE4BlGWcCQdgMaGcxzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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