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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '81b79c5b20951d759cbbd2e670a83f32a316723078e2d54014e9223ff815be88' 
  AND token = 'DFqt6Il3MRtF/Bbfvl2xnCqwasSx760t2mswzudgVpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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