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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '658e41588ac680a7994a283767b9ec722ea3f27971260d4ec75dcc2f685f5e5b' 
  AND token = 'dwcjwre+sXOYQY8IcHcm6eXnUKXtY4z1ATgrwXWavG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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