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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c8e24fb7e6b18e8bfff870281047d26a5327b84759b09c3df089b036e68fde2c' 
  AND token = 'qRuwlIevCzBuv7qPtA85/5x0WUC4BAGRKa23Fcxg17c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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