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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30f7f6863a61ff6c065b229f1de03d8ae3c5e413e84b1a7c95fb54ec0bd43f48' 
  AND token = 'cpuC1gfNsENh12JeapJosu+s9tSKjQDF269jfclWPgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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