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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a7a828e6bff8a9e3f3d5bb4d3623e90d83875e67b02228e2c3ce5568513ee9c' 
  AND token = '0O4kvABWuZ4+rkk4dqBYJc91BHcHvST2y2iukTC9XOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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