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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd641928e6e79c745dadf0ede20d02a097e207c01821aaf6a7bf74a1949b32187' 
  AND token = '41r8dXyUuQ9+zl+WMQ50tehmGBxABXpDyTP2wxtB2No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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