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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b7b65fdc9a1989a2aece6a52f56748d97c741a77987a8e8274464bbcfd16d5c' 
  AND token = 'ny2r9WvrN9LrkLdmi5mDLs87nunlDbqro6RdTa1brQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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