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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f566e7d36299be7cf0ac78bf99bae480c70c7b381fff7c972574872104e6a5e0' 
  AND token = 'cVEILS/4Fbdk+zxC57uliUCzg+yRZQVc1k7o45qJfzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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