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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '75e5819169aefd5403b09c7f04223dbd1a58e608fbd7f880ac9a4a7dc3d23247' 
  AND token = 'nOEDpwch3jeA/i+a/y47SoxkgcJtYP9MjseZr9bwPlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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