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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '03a7d5ed413031c08908c410ea5e01afc9c89d305a56ec965f0b7d386cdb240d' 
  AND token = 'NuZTiSKSz0XvTd/GfouOEG2MfcFRGJ3+jNYeITX53f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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