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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0f4a2084286f4363566ea5378284e7908a7c4358d4c12e651756e7a846dfbd4d' 
  AND token = 'FO7LiYFdaq3ua/3WagxRM88ZSbTWhm78N+2SxcVGbKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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