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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0088ffb49df24d51e30935f7efe0914a8c2bfda8daf9c56a9125183d8d47b0dd' 
  AND token = 'uX16tX0Hv2mvcs6Cq+PNIlI/0J6ime+Q6AFjNqZND6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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