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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4a0b97c1171d6a2735ebb4ee1fbaf96fb215ed4b59afc04e559a95011687418d' 
  AND token = 'Nbn+KDkw5WOobtEJ90yAsphnLwJAPrjOv5L3RjV9p5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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