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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e549e31895c6e20bae42c1c91f72ec3e4ed74612595726b47b939e9e1816490' 
  AND token = 'NuzSU1vZKYE+u5WL9epsqHqn0rdqtLXYJ4RvdGmeFpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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