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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '328973413d96dde41925e166f5e6333a0c03bc0d37ac967dd9c767b7c7806590' 
  AND token = 'BiP53kP5HtwYOXgpkseJR3O1j50RrwjYLCRlbGB+kjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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